Added new icon and button for adding contacts to list
New activity for adding contacts
Listadapter and get contacts mail adresses
Click listener for list items, Contact class
Data handling of ticked checkboxes
Merge branch 'feature/getContacts' into develop

Conflicts:
	Android/DAT255Grupp12Project/DAT255Grupp12/src/main/java/se/dat255/grupp12/MainActivity.java